Problem with legs and meshes in vrm model (bones)
One possible issue is that the meshes may possibly be linked to each other, so when you move/alter the mesh of one, the mesh of the other is moved an altered as well. You can try separating the meshes/objects.

Select the boot
Go to Object--&gt;relations--&gt;make single user--&gt;Object &amp; data

The other issue is that you may have somehow linked both boots to the same bone/armature.. You may have to unattach them and reattach them separately after making sure that only the materials/texture is linked, and not the meshes.